WO2018019033A1 - Plaque guide de lumière, module de rétroéclairage et dispositif d'affichage - Google Patents

Plaque guide de lumière, module de rétroéclairage et dispositif d'affichage Download PDF

Info

Publication number
WO2018019033A1
WO2018019033A1 PCT/CN2017/087643 CN2017087643W WO2018019033A1 WO 2018019033 A1 WO2018019033 A1 WO 2018019033A1 CN 2017087643 W CN2017087643 W CN 2017087643W WO 2018019033 A1 WO2018019033 A1 WO 2018019033A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
guide plate
light guide
sub
inclined surface
Prior art date
Application number
PCT/CN2017/087643
Other languages
English (en)
Chinese (zh)
Inventor
马永达
先建波
乔勇
Original Assignee
京东方科技集团股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 京东方科技集团股份有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US15/743,655 priority Critical patent/US10509152B2/en
Publication of WO2018019033A1 publication Critical patent/WO2018019033A1/fr

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0018—Redirecting means on the surface of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces

Definitions

  • the utility model relates to the technical field of display, in particular to a light guide plate, a backlight module and a display device.
  • the near-light area we refer to the area of the light guide plate that is closer to the light-incident surface as the near-light area, and the area that is far away from the light-surface side is called the high-beam light. region.
  • the incident light source of the side light-introducing light guide plate is arranged in the form of a plurality of discrete light sources along the longitudinal direction of the light-incident surface of the light guide plate on the light-incident surface side of the light guide plate, the brightness of the light emitted from the near-light region is usually Higher than the high light area.
  • the difference in brightness and darkness due to the difference in distance from the light surface is referred to as a vertical light and dark difference.
  • the brightness of the light exiting the light emitting surface portion aligned or corresponding to the position of each light source is generally bright, and the light exiting surface portion deviating from the position of each light source is out.
  • the brightness of the illuminating light is usually dark, for example the brightness of the portion corresponding to the midpoint position between adjacent light sources is usually the darkest.
  • the difference in brightness and darkness due to the degree of deviation from the light source in the lateral direction is hereinafter referred to as the difference in lateral brightness.
  • the difference in lateral light and dark in the near-light region is larger than in the high-light region.
  • this method increases the number of light sources per unit area and adds additional cost. And this method can not alleviate the problem of vertical light and dark differences.
  • the technical problem to be solved by the present invention is to provide a light guide plate which can simultaneously reduce the lateral brightness difference and the longitudinal brightness difference of the light guide plate light out without increasing the distribution density of the light source.
  • the light guide plate provided by the present invention includes: a first light emitting surface and a second light emitting surface,
  • the first light emitting surface and the second light emitting surface are connected by a slope
  • the first light-emitting surface is connected to the light-incident surface of the light guide plate, and is higher than the second light-emitting surface Glossy,
  • a convex structure is disposed on the inclined surface.
  • the raised structure comprises a plurality of sub-protrusion structures, each sub-protrusion structure comprising a sub-curve for partially reflecting light rays emerging from the bevel, the bus bars of the sub-curves being parallel to the bevel.
  • the distribution density of the sub-convex structures corresponding to the regions (or positions) of the light source is higher than the distribution density of the sub-convex structures corresponding to the regions between the light sources.
  • the sub-protrusion structure is triangular in cross section perpendicular to the direction of the bus bar, and/or a polygon.
  • the sub-protrusion structure has a semicircle or a semi-ellipse in a cross section perpendicular to the direction of the bus bar.
  • the plurality of sub-surfaces are the same size and/or shape.
  • an upper surface of the protruding structure is in the same plane as the first light emitting surface.
  • the inclined surface is a curved surface, wherein a distance from a partial area of the inclined surface to the light incident surface is proportional to a luminous flux received by the light incident surface corresponding to the partial area of the inclined surface.
  • the utility model also provides a backlight module, comprising the above light guide plate.
  • the present invention also provides a display device including the above backlight module.
  • a part of the light emitted from the inclined surface can be reflected back to the light guide plate through the convex structure, and reflected back and forth between the bottom surface of the light guide plate and the inclined surface to be sufficiently mixed and homogenized, and a part of the light is homogenized from
  • the second illuminating surface is emitted to compensate for the difference in longitudinal light and darkness; the other portion of the homogenized light is emitted from the convex structure on the inclined surface and the first illuminating surface, thereby reducing the difference in lateral brightness.
  • FIG. 1 is a schematic view of a light guide plate according to a first embodiment of the present invention
  • FIG. 2 is a schematic view of a light guide plate according to a second embodiment of the present invention.
  • Figure 3 is a schematic view of the curved surface of the light guide plate of Figure 2;
  • FIG. 4 is a schematic view showing a curved surface of a light guide plate according to a third embodiment of the present invention.
  • Figure 5 is a schematic view showing the density of a sub-bump structure according to an example of the present invention.
  • FIG. 6 is a schematic view showing the relationship between a sub-protrusion structure and a second plane according to an example of the present invention
  • Figure 7 is a schematic view showing the relationship between a sub-protrusion structure and a second plane according to another example of the present invention.
  • Figure 8 is a schematic view of a light guide plate according to a fourth embodiment of the present invention.
  • FIG. 9 is a schematic view showing the density of a sub-curved surface according to an example of the present invention.
  • Figure 10 is a schematic view showing an upper surface of a convex structure of a light guide plate according to a fifth embodiment of the present invention.
  • Figure 11 is a schematic view of a slope of a light guide plate according to a sixth embodiment of the present invention.
  • the light incident surface of the light guide plate is disposed thicker than the second light exit surface (main light exit surface) to facilitate the incident light to be sufficiently incident into the light guide plate.
  • the first light-emitting surface that is in contact with the light-incident surface is disposed higher than the second light-emitting surface, and the upper first light-emitting surface and the lower second light-emitting surface are connected by a slope.
  • the light source enters the light guide plate from the light incident surface, and after being reflected or scattered by the bottom surface (usually provided with a dot or a reflective coating), most of the light is emitted from the second light exit surface, but a small portion of the light is projected onto the inclined surface.
  • a semi-reflective coating may be disposed on the inclined surface to partially reflect the light projected onto the inclined surface back into the light guide plate, and The bottom surface of the light guide plate and the inclined surface are reflected back and forth to be fully mixed and homogenized, and a part of the uniformized light is emitted from the second light exiting surface to compensate for the difference in longitudinal light and darkness; the other part is uniformized light from the inclined surface of the semi-reflective coating. And the first light exit surface, thereby reducing the difference in horizontal brightness. Thereby reducing undesirable user bodies such as glare Test, improve the viewing effect.
  • the light guide plate includes a first light-emitting surface 1 and a second light-emitting surface 2, and the first light-emitting surface 1 is connected to the light-incident surface 3 of the light guide plate, and is higher than the second light-emitting surface.
  • the light exit surface 2, the first light exit surface 1 and the second light exit surface 2 are connected by a slope 4, and further includes:
  • the raised structure 5 is disposed on the slope 4, for example for reflecting a portion of the light emitted from the slope 4 back to the light guide.
  • part of the light emitted from the inclined surface 4 can be reflected back to the light guide plate by the convex structure 5, for example, as shown in FIG. 3, and reflected back and forth between the bottom surface of the light guide plate and the inclined surface 4, so as to be sufficiently mixed and homogenized.
  • a portion of the homogenized light exits from the second illuminating surface 5, compensating for the difference in longitudinal light and darkness; another portion of the homogenized light is emitted from the convex structure 5 and the first illuminating surface 1 on the inclined surface 4, thereby reducing lateral light and dark differences.
  • the raised structure 5 includes a plurality of sub-convex structures 51, each of which includes a sub-surface for reflecting a portion of the light, the busbar of the sub-surface being parallel to the bevel 4.
  • the convex structure as a plurality of sub-protrusions 51 so as to include a plurality of sub-curves, light emitted from the inclined surface can be reflected. And since the bus bar of the sub-surface is parallel to the slope, it is easy to form a curved surface that reflects the light emitted from the slope back to the light guide plate.
  • the convex structure 51 shown in FIG. 2 and FIG. 3 is a prism shape, which is only one embodiment of the present invention.
  • the shape of the convex structure 51 can be set as needed, for example, as shown in FIG. 4 .
  • the convex structure 52 is a semi-cylindrical shape as long as it can reflect a part of the light emitted from the inclined surface back to the light guide plate.
  • the busbar of the sub-surface is parallel to the ramp 4.
  • the distribution density of the sub-protrusion structures 51 corresponding to the region of the light source 6 is higher than the distribution density of the sub-protrusion structures 51 corresponding to the region between the light sources 6.
  • the sub-protrusion structure 51 may be in line contact with the second plane 2 (the contact area is a line) to reduce the influence of the sub-protrusion structure 51 on the normal light output of the second plane 2;
  • the sub-protrusion structure 52 is in surface contact with the second plane 2 (the contact area is a surface) to ensure that the slope 4 is close to the second The outgoing light at one end of the plane 2 is reflected back to the light guide plate.
  • 6 and 7 are front views of the light guide plate.
  • the convex structure corresponds the slope to the light source
  • the proportion of the exiting light of the area reflected back to the light guide plate is large, and the proportion of the outgoing light corresponding to the area between the light source and the light source is reflected back to the light guide plate is small, thereby further reducing the difference in lateral brightness and brightness and improving the viewing effect.
  • the sub-protrusion structure 51 has a triangular shape in a direction perpendicular to the bus bar direction, and/or a polygon.
  • a triangular shape in a direction perpendicular to the bus bar direction, and/or a polygon.
  • it may be a semicircle or a semi-ellipse as shown in FIG.
  • the raised structure 5 includes a curved surface for reflecting a portion of the light, and the bus bar of the curved surface is parallel to the inclined surface 4.
  • the convex structure may be integrally formed with the inclined surface or separately manufactured and then assembled to the inclined surface. And since the bus bar of the curved surface is parallel to the inclined surface, it is easy to form a curved surface that reflects the light emitted from the inclined surface back to the light guide plate.
  • the curved surface includes a plurality of sub-curved surfaces 52 of the same shape and/or size.
  • the surface By setting the surface to include a plurality of identical sub-surfaces, the light emitted from the slope can be reflected more uniformly.
  • a plan view of the light guide plate preferably has a distribution density of the sub-curves 52 of the convex structures 5 corresponding to the light source 6 which is higher than a distribution density of the sub-curves 52 corresponding to the region between the light sources 6.
  • the convex structure reflects the light emitted from the oblique surface corresponding to the light source region back to the light guide plate, and the proportion of the light emitted from the oblique surface corresponding to the light source is reflected back to the light guide plate is small, thereby further reducing
  • the difference in horizontal brightness between the emitted light improves the viewing effect.
  • the upper surface of the convex structure 5 is in the same plane as the first light-emitting surface 1.
  • the convex structure 51 is not made higher than the first light-emitting surface, and it is convenient to mount other optical elements or other optical layer structures on the first light-emitting surface 1.
  • FIG. 11 is a plan view showing another embodiment of the light guide plate, wherein the inclined surface 4 is a curved surface, a distance from a partial area of the inclined surface 4 to the light incident surface 3, and a luminous flux received by the light incident surface corresponding to a partial area of the inclined surface 4 is formed. Just proportional.
  • the first area of the inclined surface 4 facing the first light source 61 The field and the distance from the second region of the second light source 62 to the light incident surface 3 are furthest, and the third region of the slope 4 which is opposite the midpoint between the first light source 61 and the second light source 62 is closest to the light incident surface 3.
  • the amount of light received by the first region and the second region is reduced, and the difference in the amount of light received by the third region is reduced, thereby reducing the lateral brightness difference of the emitted light, thereby improving the viewing effect.
  • the utility model also provides a backlight module, comprising the above light guide plate.
  • the present invention also provides a display device including the above backlight module.
  • the display device in this embodiment may be any product or component having a display function, such as an electronic paper, a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, a navigator, and the like.
  • Exiting from the second illuminating surface compensates for the difference in longitudinal shading; another portion of the homogenized light exits from the raised structure on the slanted surface and the first illuminating surface, thereby reducing the difference in lateral brightness. Thereby reducing the bad user experience such as glare and improving the viewing effect.
  • the terms “first”, “second”, and “third” are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
  • the term “plurality” refers to two or more, unless specifically defined otherwise.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

Une plaque guide de lumière, comprenant : une première surface de sortie de lumière (1) et une seconde surface de sortie de lumière (2) qui sont reliées par une surface biseautée(4); la première surface de sortie de lumière (1) est connectée à une surface d'entrée de lumière (3) de la plaque guide de lumière, et est disposée plus haut que la seconde surface de sortie de lumière (2); la surface biseautée (4) est pourvue d'une structure saillante (5). Une partie de la lumière incidente sur la surface de biseau (4) est renvoyée vers la plaque guide de lumière par la structure en saillie (5) et réfléchie en va-et-vient entre la surface de biseau (4) et une surface inférieure de la plaque de guidage de lumière, de manière à être complètement mélangées et homogénéisées; une partie de la lumière homogénéisée sort de la seconde surface de sortie de lumière (2), compenser une différence de nuance longitudinale; l'autre partie de la lumière homogénéisée sort de la structure en saillie (5) sur la surface biseautée (4) et à partir de la première surface de sortie de lumière (1), réduisant ainsi une différence de nuance horizontale. Ainsi, la présente invention permet de réduire les occurrences d'expérience d'utilisateur de sous-par par exemple, telles que l'éblouissement, et d'améliorer les résultats de visualisation.
PCT/CN2017/087643 2016-07-29 2017-06-09 Plaque guide de lumière, module de rétroéclairage et dispositif d'affichage WO2018019033A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/743,655 US10509152B2 (en) 2016-07-29 2017-06-09 Light guide plate, backlight module and display device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201620820048.1U CN206002713U (zh) 2016-07-29 2016-07-29 导光板、背光模组和显示装置
CN201620820048.1 2016-07-29

Publications (1)

Publication Number Publication Date
WO2018019033A1 true WO2018019033A1 (fr) 2018-02-01

Family

ID=58201526

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2017/087643 WO2018019033A1 (fr) 2016-07-29 2017-06-09 Plaque guide de lumière, module de rétroéclairage et dispositif d'affichage

Country Status (3)

Country Link
US (1) US10509152B2 (fr)
CN (1) CN206002713U (fr)
WO (1) WO2018019033A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN206002713U (zh) 2016-07-29 2017-03-08 京东方科技集团股份有限公司 导光板、背光模组和显示装置
CN108169867A (zh) * 2017-12-27 2018-06-15 宿州市朗欣实业有限公司 一种可调方位的手机导光板
CN110161618A (zh) * 2019-05-30 2019-08-23 开平市盈光机电科技有限公司 一种入光面上具有光学微结构的导光板

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201035175Y (zh) * 2007-01-19 2008-03-12 台湾奈普光电科技股份有限公司 薄型背光模块的导光板结构改良
CN102563541A (zh) * 2011-08-17 2012-07-11 友达光电股份有限公司 导光板及背光模块
US20120182756A1 (en) * 2011-01-14 2012-07-19 Primax Electronics Ltd. Light guide module of scanning apparatus
CN103244869A (zh) * 2012-02-14 2013-08-14 胜华科技股份有限公司 光源装置
CN103308973A (zh) * 2012-03-15 2013-09-18 欧姆龙株式会社 面光源装置
CN206002713U (zh) * 2016-07-29 2017-03-08 京东方科技集团股份有限公司 导光板、背光模组和显示装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4894955B2 (ja) * 2008-12-17 2012-03-14 オムロン株式会社 面光源装置
TWI457620B (zh) 2011-08-17 2014-10-21 Au Optronics Corp 導光板及背光模組
US8894266B2 (en) 2012-02-14 2014-11-25 Dongguan Masstop Liquid Crystal Display Co., Ltd. Light guide device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201035175Y (zh) * 2007-01-19 2008-03-12 台湾奈普光电科技股份有限公司 薄型背光模块的导光板结构改良
US20120182756A1 (en) * 2011-01-14 2012-07-19 Primax Electronics Ltd. Light guide module of scanning apparatus
CN102563541A (zh) * 2011-08-17 2012-07-11 友达光电股份有限公司 导光板及背光模块
CN103244869A (zh) * 2012-02-14 2013-08-14 胜华科技股份有限公司 光源装置
CN103308973A (zh) * 2012-03-15 2013-09-18 欧姆龙株式会社 面光源装置
CN206002713U (zh) * 2016-07-29 2017-03-08 京东方科技集团股份有限公司 导光板、背光模组和显示装置

Also Published As

Publication number Publication date
US10509152B2 (en) 2019-12-17
US20190025493A1 (en) 2019-01-24
CN206002713U (zh) 2017-03-08

Similar Documents

Publication Publication Date Title
US7573543B2 (en) Light guide panel and display device employing the same
JP5241068B2 (ja) 側発光デバイス及びそれを光源として使用するバックライトユニット、並びにそれを採用した液晶表示装置
TWI471615B (zh) Backlight module and its optical lens
CN201521863U (zh) 一种背光模组及其导光板
TW201333385A (zh) 光源裝置
WO2018019033A1 (fr) Plaque guide de lumière, module de rétroéclairage et dispositif d'affichage
US20070211493A1 (en) Light guide plate with auxiliary light guide structures
US20140153286A1 (en) Light guide plate, backlight module and display device
US9046630B2 (en) Optical sheet and backlight assembly having the same
US20040125588A1 (en) Front light module
CN105706156A (zh) 照明设备
EP2523023A1 (fr) Affichage
TW201443368A (zh) 光學透鏡
TWI461797B (zh) 背光模組
CN103912823A (zh) 背光组件以及使用其的显示装置
TWI421549B (zh) 導光板及背光模組
CN108167683A (zh) 复合扩散板及超薄直下式背光模组
JP2008053009A (ja) 導光板及び面発光装置
CN101614370A (zh) 照明装置及采用该照明装置的显示装置
US20150192268A1 (en) Light source module
TWM445701U (zh) 背光模組及導光板
CN204964802U (zh) 导光板、背光模组和显示装置
WO2012132568A1 (fr) Module de source lumineuse et dispositif électronique équipé de celui-ci
TW201500817A (zh) 曲型背光模組
US20120242935A1 (en) Direct illumination type backlight module, bottom reflector and liquid crystal display

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17833338

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC , EPO FORM 1205A DATED 12.06.2019.

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC , EPO FORM 1205A DATED 12.06.2019.

122 Ep: pct application non-entry in european phase

Ref document number: 17833338

Country of ref document: EP

Kind code of ref document: A1